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Two cell phone companies, Nokia and Ericsson, are developing
a standard way to measure the
radiation.
Although research has not proved any connection between cell
phones and health problems, experts
believe that more research is necessary.
A neurologist in the United
States recently filed a US$800 million lawsuit against a cell
phone manufacturer. The lawsuit says that a cell phone caused
a brain tumor.
Today more than 500 million people around the world use cell
phones. The number of cell phone users is expected to increase
to more than 1 billion people in the next five years.
难点词汇：
cell phone
手机 radiation 放射物 standard
标准的
expert 专家 neurologist
神经学者 tumor 肿瘤
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